class Settings():
    '''用于存储“外星人入侵”的所有设置的类'''

    def __init__(self):
        '''初始化游戏的设置'''
        # Screen 设置.
        self.screen_width = 1000
        self.screen_height = 600
        self.bg_color = (230, 230, 230)

        # Ship 设置.
        self.ship_limit = 3

        # Bullet 设置.
        self.bullet_width = 3
        self.bullet_height = 15
        self.bullet_color = 60, 60, 60
        self.bullets_allowed = 3

        # Alien 设置.
        self.fleet_drop_speed = 10

        # 游戏加速的速度
        self.speedup_scale = 1.1
        # 外星分值增加的速度
        self.score_scale = 1.5

        self.initialize_dynamic_settings()

    def initialize_dynamic_settings(self):
        '''初始化在整个游戏中更改的设置'''
        self.ship_speed_factor = 1.5
        self.bullet_speed_factor = 3
        self.alien_speed_factor = 1

        # 分数
        self.alien_points = 50

        # fleet_direction为1代表右，-1代表左
        self.fleet_direction = 1

    def increase_speed(self):
        '''增加速度设置和外星人分值'''
        self.ship_speed_factor *= self.speedup_scale
        self.bullet_speed_factor *= self.speedup_scale
        self.alien_speed_factor *= self.speedup_scale

        self.alien_points = int(self.alien_points * self.score_scale)
